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<h1>Refer&ecirc;ncias</h1><p>
<ul><li><h2>  Unifying types and classes in Python 2.2,  by Guido van Rossum <a href="http://www.python.org/2.2.3/descrintro.html">http://www.python.org/2.2.3/descrintro.html</a></h2>
<li><h2>  PEP 252 – Making Types Look More Like Classes <a href="http://www.python.org/peps/pep-0252.html">http://www.python.org/peps/pep-0252.html</a></h2>
<li><h2>  PEP 253 – Subtyping Built-in Types <a href="http://www.python.org/peps/pep-0253.html">http://www.python.org/peps/pep-0253.html</a></h2>
<li><h2>  Metaclasses in Python 1.5, A.k.a. The Killer Joke <a href="http://www.python.org/doc/essays/metaclasses">http://www.python.org/doc/essays/metaclasses</a></h2>
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